简便方法计算(过程写出来):7⼀9+(2⼀3-4⼀9)= 12⼀5-(5⼀6+2⼀5)= 13⼀15-5⼀12-1⼀12+2⼀15=

2024-11-22 08:11:51
推荐回答(1个)
回答1:

7/9-4/9+2/3=1/3+2/3=1
12/5-2/5-5/6=2-5/6=7/6
13/15+2/15-(5/12+1/12)=1-1/2=1/2